Lighting unit



FIG. 1 is an upper perspective view showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a side elevational view thereof, the opposite side view being a mirror image;

FIG. 4 is a bottom plan view thereof; and,

FIG. 5 is a bottom perspective view thereof. 

The ornamental design for a lighting unit, as shown and described. 